蛋白S是一种维生素K依赖性血浆蛋白,具有抗血栓形成的作用。它与其它血浆蛋白、蛋白C,在Ⅴ和Ⅷ因子水平上协同抑制血凝块的连锁反应。先天性蛋白S缺乏是一种比较少见的常染色体显性遗传性疾患,其临床表现特征为年青人的动脉或静脉的血栓形成。本文叙述一例25岁女性,妊娠38周,有糖尿病史14年,4个月前查眼底未见糖尿病性改变。就诊时视力右眼20/40,左眼20/15,右眼底有少数几片斑点状出血及黄斑中心凹上方视网膜分枝动脉阻塞,相应处的视野下方有暗 Protein S is a vitamin K-dependent plasma protein that has antithrombotic effects. It works synergistically with other plasma proteins, protein C, at the â ... ¢ and â ... â ... â ... ƒ levels of the clotting chain reaction. Congenital Protein S deficiency is a rare, autosomal dominant inherited disorder characterized by thrombosis of young arteries or veins. This article describes a 25-year-old female, 38 weeks of gestation, with a history of diabetes 14 years, 4 months ago did not check the fundus of diabetic changes. Visits when the right eye 20/40, left eye 20/15, the right fundus of a few spot-like bleeding and foveal retinacchial branch artery occlusion above the corresponding Department of vision under the dark